| 摘要 |
PROBLEM TO BE SOLVED: To provide a power window switch circuit which can surely cause window panes to fall or rise according to the operation of a fall switch or a rise switch when the power window switch circuit is immersed in water. SOLUTION: When a power window switch circuit 10 is immersed in water, a leak detecting circuit 15 and transistors TR4, TR5 are turned on and a transistor TR1 is turned off. Then relay coils 21, 23 each have a low electric potential at each end, so a driving motor M is not driven nor will window panes fall or rise. Under these conditions, when a fall switch 128 is turned on, a high electric potential is supplied to the plus terminal of the relay coil 21 via a first moving contact 131 and the relay coil 21 is excited to rotate the driving motor M in the normal direction to cause the window panes to fall. |
